What's the difference between Main ( ) and Main { } ?

Question

I have been searching around, but still no luck finding the difference between Main ( ) and Main { }. I found that java uses ( ), and javafx uses { }. But in javafx I can still use ( ). Is there different meaning?
Thanks.

Answer 1

I am not sure what you mean, but I will take a guess.
Remember just one thing:
1) You can easily instantiate a class to an object in JAVAFX using a JAVA or JAVAFX class, but in JAVA you can only instantiate JAVA objects.
(Not completely true. If you really want a headache then you can instantiate JAVAFX classes in JAVA, but it is not easy.)
Let me give you the following class that contains some variable:
JAVA
class MainJava {
     int     blaInt;
     long    blaLong;
     String  someString;
     String  anotherString = "(First Bicycle) Look mom no Hands... Look Mom no teeth.";
     public MainJava() {
         // Before this contructor runs all variables will first be initializes to their default values or whatever you put in them above
         // Construct things :)
     } // END CONSTRUCTOR for MainJava
} // END CLASS MainJavaJAVAFX
class MainJavaFx {
     var     blaInt : Integer;
     var     blaLong : java.lang.Long; // The most usefull number made difficult in JAVAFX :(
     var     someString : String;
     var     anotherString = "(First Bicycle) Look mom no Hands... Look Mom no teeth."; // Thats nice. No need for a type :) Heaven ... I'm in Heaven
     init {
         // Before this contructor runs all variables will first be initializes to their default values or whatever you put in them above
         // Construct things :)
     } // END CONSTRUCTOR for MainJava
} // END CLASS MainJavaFxThese 2 classes are affectively the same.
One written in Java and one in JAVAFX.
You already seem to know JAVA so I am going to talk in JAVAFX code from now on.
1) To instantiate a JAVA class in JAVAFX is the same as in JAVA.
  var myNewObj = new MainJava();2) To instantiate a JAVAFX class in JAVAFX you do the following.
  var myNewObj = MainJavaFx{}; // Weeeee .. easy hey :) I likeThink of init{} as the contractor of the class in JAVAFX, because there is no more constructors in JAVAFX like in JAVA.
Also in JAVA you can pass parameters to the class constructor, whereas in JAVAFX that is not possible anymore.
So sad, but what JAVAFX taketh away ... JAVAFX giveth so muchth moreth ... th...
Now witness the power of ... JAVAFX ...
In JAVAFX you can instantiate any "var" variables when you create the object from the class.
Therefore you do not need to pass parameters to the init constructor, most of the time you do not even need init.
So lets say you want to give the class variable other default values in the JAVAFX class then you can do it like this:
  var myNewObj = MainJavaFx{ 
                                               blaLong : java.lang.System.currentTimeMillis()
                                               blaInt : 1234
                                               someString : "Going to the Hospital I see"
                                               anotherString : "Thorry Mom."
                                      }; // Weeeee .. easy hey :) I likeNow isn't that nice.
Keep in mind that the init{} and postinit{} code blocks will only run if they exist after the object is created and therefore the variables will already be changed to the values you have given them when you instantiated the class.
Cool hey :)
You can not do that to a JAVA object, but then again if you need to change the class variables of a JAVA object then just create a constructor that takes paramaters and update the class variables in the constructor.